[IMP] base, web: static xml templates support serverside inheritance

QWeb templates that show up in the 'qweb' key of a module's manifest
now support server side inheritance and xpath evaluation

QWeb templates that show up in the xmlDependencies of a JS widget are not
impacted at all by theses changes, as they are served through the
Werkzeug sharedMiddleware

A similar syntax than ir.ui.view has been implemented in the QWeb templates
- each template must have a root node, whatever tag works

- the root node of a template must have a t-name containing the name of the template
The name -- without the module's name -- may contain dots pretty much anywhere
Though what is recommended is only underscores in template names

- if a template is to inherit from a parent, the root node has a t-inherit directive
containing either the full name of the template it inherits from which is module_name.template_name
or the name of the template, no module name necessary, if the parent template is in the same module

- there are 2 modes of inheriting
primary: copy the behavior of the parent into the template
extension: modifies the parent in place

Task: 1999528

closes odoo/odoo#33892

Signed-off-by: VincentSchippefilt <VincentSchippefilt@users.noreply.github.com>


Co-authored-by: Julien Mougenot <jum@odoo.com>
Co-authored-by: Lucas Perais <lpe@odoo.com>

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